Name: staining protocols for human pancreatic islets
Uploaded: 2012-05-23T13:00:00
Description: Watch this Scientific Journal Video about Staining Protocols for Human Pancreatic Islets at JoVE.com

लेखकों &#39;दाताओं के परिवारों और अंग प्रत्यारोपण खरीद संगठन में शामिल उनके विशेषज्ञ की सहायता के लिए इस अनुसंधान और एमिली मांटगोमेरी, रॉबर्ट Pietras, एन फू, मिताली अग्रवाल, रोशन अग्रवाल धन्यवाद. इस काम अग्नाशय के मधुमेह के साथ अंग दाताओं के लिए नेटवर्क के समर्थन में किशोर मधुमेह अनुसंधान फाउंडेशन (MC-T.) द्वारा वित्त पोषित किया गया.

1. बेदाग अनुभाग के लिए microtomy <ol><li> ऊपर के रूप में मानक तेल microtomy के लिए पानी स्नान और सूक्ष्म सेट करें. मामले नंबर, अग्न्याशय क्षेत्र (नमूना) और स्लाइड संख्या के साथ सकारात्मक आरोप लगाया स्लाइड्स और पूर्व लेबल ?...

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आईएचसी प्रक्रियाओं का मानकीकरण छवि विश्लेषण के लिए महत्वपूर्ण है, खासकर जब समय के साथ स्लाइड्स की बड़ी संख्या पार कंप्यूटर आधारित एल्गोरिदम का उपयोग करते हुए. आईएचसी धुंधला इस रिपोर्ट में वर्णित प्र?...

<table border="1"><tbody><tr><td> अभिकर्मक का नाम </td><td> कंपनी </td><td> सूचीपत्र संख्या </td><td> टिप्पणियाँ </td></tr><tr><td> 30% हाइड्रोजन पेरोक्साइड (एच 2 2 हे) </td><td> FisherScientific </td><td> H325 - 500 </td><td> अंतर्जात peroxidase अवरुद्ध </td></tr><tr><td> एबीसी alkaline फॉस्फेट (एपी) </td><td> वेक्टर </td><td> एके 5000 </td><td> एपी संयुग्म </td></tr><tr><td> एंटीबॉडी मंदक </td><td> Invitrogen </td><td> 003,218 </td><td> प्राथमिक एंटीबॉडी </td></tr><tr><td> Avidin ब्लॉकर </td><td> वेक्टर </td><td> SP-2001 </td><td> अंतर्जात बायोटिन ब्लॉक </td></tr><tr><td> Biotinylated बकरी विरोधी गिनी सुअर </td><td> वेक्टर </td><td> बीए-7000 </td><td> माध्यमिक एंटीबॉडी </td></tr><tr><td> अभिकर्मक उदास </td><td> FisherScientific </td><td> 7301 </td><td> Leica autostaineआर </td></tr><tr><td> साइट्रेट बफर, पीएच 6.0 </td><td> BioGenex </td><td> HK086-9K </td><td> प्रतिजन पुनर्प्राप्ति </td></tr><tr><td> 1 निर्मलक </td><td> FisherScientific </td><td> 7401 </td><td> Leica autostainer </td></tr><tr><td> Cytoseal XYL </td><td> FisherScientific </td><td> 8312-4 </td><td> Coverslip mountant </td></tr><tr><td> थपका </td><td> वेक्टर </td><td> एस-4100 </td><td> एचआरपी वर्णकोत्पादक </td></tr><tr><td> Deeb </td><td> Dako </td><td> S2003 </td><td> अंतर्जात एपी अभिकर्मक अवरुद्ध </td></tr><tr><td> लाल भामसान रंग मादक वाई </td><td> FisherScientific </td><td> 71,204 </td><td> Leica autostainer </td></tr><tr><td> Ethanols-100%, 95%, 90%, 70% </td><td> FisherScientific </td><td> विभिन्न </td><td> Deparaffinization और coverslipping </td></tr><tr><td> Hematoxylin </td><td> Dako </td><td> S3301 </td><td> Dako autostainer </td></tr><tr><td> 7211 hematoxylin </td><td> FisherScientific </td><td> 7211 </td><td> Leica autostainer </td></tr><tr><td> आईजीजी (प्राथमिक एंटीबॉडी के लिए सभी मेजबान प्रजातियों) </td><td> विभिन्न </td><td> विभिन्न </td><td> प्राइमरी के लिए नकारात्मक नियंत्रण </td></tr><tr><td> तरल स्थायी लाल (LPR) </td><td> Dako </td><td> K0640 </td><td> एपी वर्णकोत्पादक </td></tr><tr><td> Mach2 एपी </td><td> Biocare चिकित्सा </td><td> MALP521L </td><td> बकरी विरोधी माउस एपी संयुग्म </td></tr><tr><td> Mach2 एचआरपी </td><td> Biocare चिकित्सा </td><td> MHRP520L </td><td> बकरी विरोधी माउस एचआरपी संयुग्म </td></tr><tr><td> Mach2 एचआरपी </td><td> Biocare चिकित्सा </td><td> RHRP520L </td><td> बकरी विरोधी माउस एचआरपी संयुग्म </td></tr><tr><td> मेथनॉल </td><td> FisherScientific </td><td> विभिन्न </td><td> एच 2 हे 2 मंदक </td></tr><tr><td> सामान्य बकरी सीरम </td><td> वेक्टर </td><td> S-1000 </td><td> आईएचसी अवरुद्ध अभिकर्मक </td></tr><tr><td> निशानाबाज़ </td><td> Biocare चिकित्सा </td><td> BS966M </td><td> आईएचसी अवरुद्ध अभिकर्मक </td></tr><tr><td> 20X TBST </td><td> ThermoScientific </td><td> TA-999 - टीटी </td><td> आईएचसी बफर </td></tr><tr><td> 20x triology </td><td> सेल मार्क </td><td> 920P - 06 </td><td> प्रतिजन पुनर्प्राप्ति </td></tr><tr><td> Xylene </td><td> FisherScientific </td><td> विभिन्न </td><td> Deparaffinization और coverslipping </td></tr></tbody></table> 1 टेबल विशिष्ट अभिकर्मकों. <table border="1"><tbody><tr><td> प्राथमिक एंटीबॉडी </td><td> मेजबान प्रजातियों </td><td> विक्रेता </td><td> बिल्ली. # </td><td> टिप्पणियाँ और एंटीजन रिट्रीवल </td></tr><tr><td> तेल </td><td></td><td></td><td></td><td></td></tr><tr><td> एमिलेज </td><td> माउस </td><td> सांता क्रुज़ </td><td> SC - 46,657 </td><td> सिट्रट </td></tr><tr><td> Amylin </td><td> माउस </td><td> Supplier: </td><td> MCA11267 </td><td> सिट्रट </td></tr><tr><td> कार्बोनिक 19.9 एक एंजाइम जो किसी रासायनिक यौगिक से जल के अलग होने को उत्तेजित करता है </td><td> माउस </td><td> Abcam </td><td> ab15146 </td><td></td></tr><tr><td> कस्पासे 3 Cleaved, </td><td> खरगोश </td><td> सेल संकेतन </td><td> 9961 </td><td> साइट्रेट या त्रयी </td></tr><tr><td> CD20 </td><td> माउस </td><td> Dako </td><td> M0755 </td><td> साइट्रेट या त्रयी </td></tr><tr><td> CD3 </td><td> खरगोश </td><td> Dako </td><td> A0452 </td><td> सिट्रट </td></tr><tr><td> CD34 </td><td> माउस </td><td> सेल संकेतन </td><td> 3569 </td><td> सिट्रट </td></tr><tr><td> सीडी 4 </td><td> माउस </td><td> Dako </td><td> M7310 </td><td> सिट्रट </td> &lt;/ Tr&gt; <tr><td> CD45 </td><td> माउस </td><td> Dako </td><td> M0754 </td><td> सिट्रट </td></tr><tr><td> CD68 </td><td> माउस </td><td> Dako </td><td> M0876 </td><td> सिट्रट </td></tr><tr><td> सीडी 8 </td><td> माउस </td><td> Dako </td><td> M7103 </td><td> सिट्रट </td></tr><tr><td> एक Chromogranin </td><td> खरगोश </td><td> Dako </td><td> A0430 </td><td> सिट्रट </td></tr><tr><td> CK17 </td><td> माउस </td><td> Dako </td><td> M7046 </td><td> सिट्रट </td></tr><tr><td> CK19 </td><td> माउस </td><td> Dako </td><td> M0772 </td><td> सिट्रट </td></tr><tr><td> CK7 </td><td> माउस </td><td> Dako </td><td> M7018 </td><td> सिट्रट </td></tr><tr><td> सी - पेप्टाइड </td><td> खरगोश </td><td> सेल संकेतन </td><td> 4593 </td><td> सिट्रट </td></tr><tr><td> Foxp3 </td><td> चूहा </td><td> बायोसाइंस ई </td><td> 14-4776-80 </td&gt; <td> सिट्रट </td></tr><tr><td> Ghrelin </td><td> बकरी </td><td> सांता क्रुज़ </td><td> SC - 10,386 </td><td></td></tr><tr><td> Ghrelin </td><td> खरगोश </td><td> Abcam </td><td> ab85104 </td><td></td></tr><tr><td> ग्लूकागन </td><td> खरगोश </td><td> Dako </td><td> A0565 </td><td></td></tr><tr><td> ग्लूकागन </td><td> माउस </td><td> Abcam </td><td> ab10988 </td><td> सिट्रट </td></tr><tr><td> ग्लूकागन </td><td> गिनी पिग </td><td> Bachem </td><td> टी - 5037 </td><td> सिट्रट </td></tr><tr><td> भरमार - 1 </td><td> माउस </td><td> Abcam </td><td> ab40084 </td><td> त्रयी </td></tr><tr><td> भरमार - 2 </td><td> खरगोश </td><td> सांता क्रुज़ </td><td> SC-9117 </td><td> मानव islets में व्यक्त नहीं </td></tr><tr><td> इन्सुलिन </td><td> गिनी पिग </td><td> Dako </td><td> A0564 </td><td></td></tr> &lt;tr&gt; <td> की-67 </td><td> माउस </td><td> Dako </td><td> M7240 </td><td> सिट्रट </td></tr><tr><td> Mafa </td><td> खरगोश </td><td> Novus जैव </td><td> NB400-137A </td><td> त्रयी </td></tr><tr><td> पॉलीपेप्टाइड अग्नाशय </td><td> खरगोश </td><td> Invitrogen </td><td> 18-0043 </td><td> सिट्रट </td></tr><tr><td> PDX-1 </td><td> गिनी पिग </td><td> Abcam </td><td> ab47308 </td><td> साइट्रेट या त्रयी </td></tr><tr><td> Proinsulin </td><td> माउस </td><td> Novocastra </td><td> एनसीएल - proin के-1G4 </td><td></td></tr><tr><td> Proinsulin </td><td> माउस </td><td> विकास स्टडीज हाइब्रिडोमा बैंक </td><td> जी एस-9A8 </td><td> सिट्रट </td></tr><tr><td> Secretagogin </td><td> खरगोश </td><td> सिग्मा </td><td> ०,०६,६४१ HPA </td><td> सिट्रट </td></tr><tr><td> चिकनी पेशी actin </td><td> खरगोश </td><td> Abcam </td><td> ab5694 &lt;/ P&gt; <td></td></tr><tr><td> Somatostatin </td><td> खरगोश </td><td> Dako </td><td> A0566 </td><td></td></tr><tr><td> Synaptophysin </td><td> माउस </td><td> Dako </td><td> M0776 </td><td> सिट्रट </td></tr><tr><td> जमे हुए ताजा </td><td> मेजबान प्रजातियों </td><td> विक्रेता </td><td> बिल्ली. # </td><td> टिप्पणियाँ </td></tr><tr><td> CD11b </td><td> चूहा </td><td> Abcam </td><td> ab6332 </td><td> पीएफ के साथ फिक्स में 4% </td></tr><tr><td> CD11c </td><td> खरगोश </td><td> Supplier: </td><td> AHP1226 </td><td></td></tr><tr><td> CD25 </td><td> माउस </td><td> Novus जैव </td><td> 600-564 एनबी </td><td> आयल वर्गों के लिए रात भर ऊष्मायन का प्रयोग करें </td></tr><tr><td> CD94 </td><td> माउस </td><td> Abcam </td><td> ab61874 </td><td> एसीटोन के साथ फिक्स </td></tr><tr><td> GAD65 </td><td> माउस </td><td> सांता क्रुज़ </td><td> SC-130,569 </td><td> पीएफ के साथ फिक्स में 4% </td></tr><tr><td> एचएलए एबीसी </td><td> माउस </td><td> Dako </td><td> M0736 </td><td> एसीटोन या 4% पीएफ के साथ फिक्स </td></tr></tbody></table> 2 टेबल प्राथमिक एंटीबॉडी. <table border="1"><tbody><tr><td> अभिकर्मक का नाम </td><td> कंपनी </td><td> सूचीपत्र संख्या </td><td> टिप्पणियाँ </td></tr><tr><td> Aperio Scanscope CS </td><td> Aperio </td><td></td><td> डिजिटल स्लाइड स्कैनर </td></tr><tr><td> Dako Autostainer प्लस </td><td> Dako </td><td></td><td> आईएचसी दाग </td></tr><tr><td> लेबल मैट्रिक्स मुद्रण सॉफ्टवेयर </td><td> BioCarta </td><td> LM7UP57 </td><td> स्लाइड लेबल सॉफ्टवेयर </td></tr><tr><td> Leica एक्स्ट्रा लार्ज Autostainer </td><td>Leica </td><td></td><td> एच और ई दाग </td></tr><tr><td> प्रीमियम coverglass </td><td> FisherScientific </td><td> 12-548-5J </td><td> Coverslip </td></tr><tr><td> स्पेक्ट्रम सूचना प्रबंधक </td><td> Aperio </td><td></td><td> स्कैनर सॉफ्टवेयर </td></tr><tr><td> Superfrost प्लस स्लाइड </td><td> FisherScientific </td><td> 12-550-15 </td><td> सकारात्मक चार्ज स्लाइड </td></tr><tr><td> सब्जी स्टीमर </td><td> काले और डेकर </td><td> विभिन्न </td><td> प्रतिजन पुनर्प्राप्ति </td></tr><tr><td> ज़ेबरा 3742 TLP </td><td> CDWG </td><td> TLP3742 </td><td> स्लाइड लेबल प्रिंटर </td></tr></tbody></table> तालिका 3 विशिष्ट सामग्री और उपकरणों.

staining protocols for human pancreatic islets

Estimates of islet area and numbers and endocrine cell composition in the adult human pancreas vary from several hundred thousand to several million and beta mass ranges from 500 to 1500 mg 1-3. With this known heterogeneity, a standard processing and staining procedure was developed so that pancreatic regions were clearly defined and islets characterized using rigorous histopathology and immunolocalization examinations. 
Standardized procedures for processing human pancreas recovered from organ donors are described in part 1 of this series. The pancreas is processed into 3 main regions (head, body, tail) followed by transverse sections. Transverse sections from the pancreas head are further divided, as indicated based on size, and numbered alphabetically to denote subsections. This standardization allows for a complete cross sectional analysis of the head region including the uncinate region which contains islets composed primarily of pancreatic polypeptide cells to the tail region.
The current report comprises part 2 of this series and describes the procedures used for serial sectioning and histopathological characterization of the pancreatic paraffin sections with an emphasis on islet endocrine cells, replication, and T-cell infiltrates. Pathology of pancreatic sections is intended to characterize both exocrine, ductular, and endocrine components. The exocrine compartment is evaluated for the presence of pancreatitis (active or chronic), atrophy, fibrosis, and fat, as well as the duct system, particularly in relationship to the presence of pancreatic intraductal neoplasia4. Islets are evaluated for morphology, size, and density, endocrine cells, inflammation, fibrosis, amyloid, and the presence of replicating or apoptotic cells using H&amp;E and IHC stains. 
The final component described in part 2 is the provision of the stained slides as digitized whole slide images. The digitized slides are organized by case and pancreas region in an online pathology database creating a virtual biobank. Access to this online collection is currently provided to over 200 clinicians and scientists involved in type 1 diabetes research. The online database provides a means for rapid and complete data sharing and for investigators to select blocks for paraffin or frozen serial sections.

Watch this Scientific Journal Video about Staining Protocols for Human Pancreatic Islets at JoVE.com

Staining Protocols for Human Pancreatic Islets

इस वीडियो hematoxylin और लाल भामसान रंग (एच एंड ई) और immunohistochemistry (आईएचसी) का उपयोग मानव अग्नाशय islets के लक्षण वर्णन के लिए प्रक्रियाओं को दर्शाता है. सिर, शरीर, और पूंछ क्षेत्रों से अग्नाशय वर्गों दोनों एच और ई और आईएचसी द्वारा दाग रहे हैं आइलेट (इंसुलिन, ग्लूकागन, और अग्नाशय पॉलीपेप्टाइड) अंत: स्रावी रचना, सेल प्रतिकृति (Ki67), और भड़काऊ पैठ (एच ई, CD3) निर्धारित करने के लिए. हुकदार, घुमावदार या टेढ़ा क्षेत्र पॉलीपेप्टाइड अग्नाशय के लिए आईएचसी का उपयोग स्थानीय है.

मानव अग्नाशय islets के लिए धुंधला हो जाना प्रोटोकॉल

Estimates of islet area and numbers and endocrine cell composition in the adult human pancreas vary from several hundred thousand to several million and ...

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Research

JoVE Journal

Medicine

Isolation of Human Islets from Partially Pancreatectomized Patients

Investigations into the pathogenesis of type 2 diabetes and islets of Langerhans malfunction 1 have been hampered by the limited availability of type 2 diabetic islets from organ donors2. Here we share our protocol for isolating islets from human pancreatic tissue obtained from type 2 diabetic and non-diabetic patients who have undergone partial pancreatectomy due to different pancreatic diseases (benign or malignant pancreatic tumors, chronic pancreatitis, and common bile duct or duodenal tumors). All patients involved gave their consent to this study, which had also been approved by the local ethics committee. The surgical specimens were immediately delivered to the pathologist who selected soft and healthy appearing pancreatic tissue for islet isolation, retaining the damaged tissue for diagnostic purposes. We found that to isolate more than 1,000 islets, we had to begin with at least 2 g of pancreatic tissue. Also essential to our protocol was to visibly distend the tissue when injecting the enzyme-containing media and subsequently mince it to aid digestion by increasing the surface area.
To extend the applicability of our protocol to include the occasional case in which a large amount (&gt;15g) of human pancreatic tissue is available , we used a Ricordi chamber (50 ml) to digest the tissue. During digestion, we manually shook the Ricordi chamber3 at an intensity that varied by specimen according to its level of tissue fibrosis. A discontinous Ficoll gradient was then used to separate the islets from acinar tissue. We noted that the tissue pellet should be small enough to be homogenously resuspended in Ficoll medium with a density of 1.125 g/ml. After isolation, we cultured the islets under stress free conditions (no shaking or rotation) with 5% CO2 at 37 &deg;C for at least 48 h in order to facilitate their functional recovery. Widespread application of our protocol and its future improvement could enable the timely harvesting of large quantities of human islets from diabetic and clinically matched non-diabetic subjects, greatly advancing type 2 diabetes research.

The supply of type 2 diabetic islets for research is insufficient. Here we share our protocol for isolating islets from patients undergoing partial pancreatectomy. This approach represents a unique venue for obtaining islets from type 2 diabetic and clinically matched non-diabetic subjects in adequate numbers for basic and clinical studies.

मानव islets के मरीजों को आंशिक रूप से Pancreatectomized से अलगाव

Investigations into the pathogenesis of type 2 diabetes and islets of Langerhans malfunction 1 have been hampered by the limited availability of type 2 ...

Immunohistochemical Staining of B7-H1 (PD-L1) on Paraffin-embedded Slides of Pancreatic Adenocarcinoma Tissue

B7-H1/PD-L1, a member of the B7 family of immune-regulatory cell-surface proteins, plays an important role in the negative regulation of cell-mediated immune responses through its interaction with its receptor, programmed death-1 (PD-1) 1,2. Overexpression of B7-H1 by tumor cells has been noted in a number of human cancers, including melanoma, glioblastoma, and carcinomas of the lung, breast, colon, ovary, and renal cells, and has been shown to impair anti-tumor T-cell immunity3-8.
Recently, B7-H1 expression by pancreatic adenocarcinoma tissues has been identified as a potential prognostic marker9,10. Additionally, blockade of B7-H1 in a mouse model of pancreatic cancer has been shown to produce an anti-tumor response11. These data suggest the importance of B7-H1 as a potential therapeutic target. Anti-B7-H1 blockade antibodies are therefore being tested in clinical trials for multiple human solid tumors including melanoma and cancers of lung, colon, kidney, stomach and pancreas12.
In order to eventually be able to identify the patients who will benefit from B7-H1 targeting therapies, it is critical to investigate the correlation between expression and localization of B7-H1 and patient response to treatment with B7-H1 blockade antibodies. Examining the expression of B7-H1 in human pancreatic adenocarcinoma tissues through immunohistochemistry will give a better understanding of how this co-inhibitory signaling molecule contributes to the suppression of antitumor immunity in the tumor's microenvironment. The anti-B7-H1 monoclonal antibody (clone 5H1) developed by Chen and coworkers has been shown to produce reliable staining results in cryosections of multiple types of human neoplastic tissues4,8, but staining on paraffin-embedded slides had been a challenge until recently13-18. We have developed the B7-H1 staining protocol for paraffin-embedded slides of pancreatic adenocarcinoma tissues. The B7-H1 staining protocol described here produces consistent membranous and cytoplasmic staining of B7-H1 with little background.

Immunohistochemical Staining of B7-H1 PD-L1 on Paraffin-embedded Slides of Pancreatic Adenocarcinoma Tissue

B7-H1 (PD-L1) and its binding to PD-1 provide a major tumor-induced immunosuppressive signal in the tumor&#x2019;s microenvironment. An immunohistochemical staining technique to characterize the expression and localization of B7-H1 in pancreatic adenocarcinoma is described here.

अग्नाशय के Adenocarcinoma ऊतक B7-H1 immunohistochemical धुंधला (पीडी L1) आयल एम्बेडेड स्लाइड्स

B7-H1/PD-L1, a member  of the B7 family of immune-regulatory cell-surface proteins, plays an important  role in the negative regulation of cell-mediated ...

Surgical Procedures for a Rat Model of Partial Orthotopic Liver Transplantation with Hepatic Arterial Reconstruction

Orthotopic liver transplantation (OLT) in rats using a whole or partial graft is an indispensable experimental model for transplantation research, such as studies on graft preservation and ischemia-reperfusion injury 1,2, immunological responses 3,4, hemodynamics 5,6, and small-for-size syndrome 7. The rat OLT is among the most difficult animal models in experimental surgery and demands advanced microsurgical skills that take a long time to learn. Consequently, the use of this model has been limited. Since the reliability and reproducibility of results are key components of the experiments in which such complex animal models are used, it is essential for surgeons who are involved in rat OLT to be trained in well-standardized and sophisticated procedures for this model.
While various techniques and modifications of OLT in rats have been reported 8 since the first model was described by Lee et al. 9 in 1973, the elimination of the hepatic arterial reconstruction 10 and the introduction of the cuff anastomosis technique by Kamada et al. 11 were a major advancement in this model, because they simplified the reconstruction procedures to a great degree. In the model by Kamada et al., the hepatic rearterialization was also eliminated. Since rats could survive without hepatic arterial flow after liver transplantation, there was considerable controversy over the value of hepatic arterialization. However, the physiological superiority of the arterialized model has been increasingly acknowledged, especially in terms of preserving the bile duct system 8,12 and the liver integrity 8,13,14.
In this article, we present detailed surgical procedures for a rat model of OLT with hepatic arterial reconstruction using a 50% partial graft after ex vivo liver resection. The reconstruction procedures for each vessel and the bile duct are performed by the following methods: a 7-0 polypropylene continuous suture for the supra- and infrahepatic vena cava; a cuff technique for the portal vein; and a stent technique for the hepatic artery and the bile duct.

Orthotopic liver transplantation in rats is an indispensable experimental model for biomedical research. Here we present our surgical procedures for orthotopic rat liver transplantation with hepatic arterial reconstruction using a 50% partial graft.

यकृत धमनी पुनर्निर्माण के साथ आंशिक orthotopic लीवर ट्रांसप्लांटेशन के एक चूहे मॉडल के लिए शल्य चिकित्सा प्रक्रियाओं

Orthotopic liver transplantation (OLT) in rats using a whole or partial graft is an indispensable experimental model for transplantation research, such as ...

Improved Protocol For Laser Microdissection Of Human Pancreatic Islets From Surgical Specimens

Laser microdissection (LMD) is a technique that allows the recovery of selected cells and tissues from minute amounts of parenchyma 1,2. The dissected cells can be used for a variety of investigations, such as transcriptomic or proteomic studies, DNA assessment or chromosomal analysis 2,3. An especially challenging application of LMD is transcriptome analysis, which, due to the lability of RNA 4, can be particularly prominent when cells are dissected from tissues that are rich of RNases, such as the pancreas. A microdissection protocol that enables fast identification and collection of target cells is essential in this setting in order to shorten the tissue handling time and, consequently, to ensure RNA preservation. 
Here we describe a protocol for acquiring human pancreatic beta cells from surgical specimens to be used for transcriptomic studies 5. Small pieces of pancreas of about 0.5-1 cm3 were cut from the healthy appearing margins of resected pancreas specimens, embedded in Tissue-Tek O.C.T. Compound, immediately frozen in chilled 2-Methylbutane, and stored at -80 &deg;C until sectioning. Forty serial sections of 10 &mu;m thickness were cut on a cryostat under a -20 &deg;C setting, transferred individually to glass slides, dried inside the cryostat for 1-2 min, and stored at -80 &deg;C. 
Immediately before the laser microdissection procedure, sections were fixed in ice cold, freshly prepared 70% ethanol for 30 sec, washed by 5-6 dips in ice cold DEPC-treated water, and dehydrated by two one-minute incubations in ice cold 100% ethanol followed by xylene (which is used for tissue dehydration) for 4 min; tissue sections were then air-dried afterwards for 3-5 min. Importantly, all steps, except the incubation in xylene, were performed using ice-cold reagents - a modification over a previously described protocol 6. utilization of ice cold reagents resulted in a pronounced increase of the intrinsic autofluorescence of beta cells, and facilitated their recognition. For microdissection, four sections were dehydrated each time: two were placed into a foil-wrapped 50 ml tube, to protect the tissue from moisture and bleaching; the remaining two were immediately microdissected. This procedure was performed using a PALM MicroBeam instrument (Zeiss) employing the Auto Laser Pressure Catapulting (AutoLPC) mode. The completion of beta cell/islet dissection from four cryosections required no longer than 40-60 min. Cells were collected into one AdhesiveCap and lysed with 10 &mu;l lysis buffer. Each single RNA specimen for transcriptomic analysis was obtained by combining 10 cell microdissected samples, followed by RNA extraction using the Pico Pure RNA Isolation Kit (Arcturus). This protocol improves the intrinsic autofluorescence of human beta cells, thus facilitating their rapid and accurate recognition and collection. Further improvement of this procedure could enable the dissection of phenotypically different beta cells, with possible implications for better understanding the changes associated with type 2 diabetes.

Laser microdissection is a technique that allows the recovery of selected cells from minute amounts of parenchyma. Here we describe a protocol for acquiring human pancreatic islets from surgical specimens to be used for transcriptomic studies. Our protocol improves the intrinsic autofluorescence of human beta cells, thus facilitating their collection.

मानव अग्नाशय islets के सर्जिकल नमूनों से लेजर Microdissection में सुधार के लिए प्रोटोकॉल

Laser microdissection (LMD) is a technique that allows the recovery of selected cells and tissues from minute amounts of parenchyma 1,2. The dissected ...

Bioluminescent Orthotopic Model of Pancreatic Cancer Progression

Pancreatic cancer has an extremely poor five-year survival rate of 4-6%. New therapeutic options are critically needed and depend on improved understanding of pancreatic cancer biology. To better understand the interaction of cancer cells with the pancreatic microenvironment, we demonstrate an orthotopic model of pancreatic cancer that permits non-invasive monitoring of cancer progression. Luciferase-tagged pancreatic cancer cells are resuspended in Matrigel and delivered into the pancreatic tail during laparotomy. Matrigel solidifies at body temperature to prevent leakage of cancer cells during injection. Primary tumor growth and metastasis to distant organs are monitored following injection of the luciferase substrate luciferin, using in vivo imaging of bioluminescence emission from the cancer cells. In vivo imaging also may be used to track primary tumor recurrence after resection. This orthotopic model is suited to both syngeneic and xenograft models and may be used in pre-clinical trials to investigate the impact of novel anti-cancer therapeutics on the growth of the primary pancreatic tumor and metastasis.

Improved understanding of pancreatic cancer biology is critically needed to enable the development of better therapeutic options to treat pancreatic cancer. To address this need, we demonstrate an orthotopic model of pancreatic cancer that permits non-invasive monitoring of cancer progression using in vivo bioluminescence imaging.

अग्नाशय के कैंसर प्रगति की bioluminescent Orthotopic के लिए मॉडल

Pancreatic cancer has an extremely poor five-year survival rate of 4-6%.  New therapeutic options are critically needed and depend on improved ...

Steps for the Autologous Ex vivo Perfused Porcine Liver-kidney Experiment

The use of ex vivo perfused models can mimic the physiological conditions of the liver for short periods, but to maintain normal homeostasis for an extended perfusion period is challenging. We have added the kidney to our previous ex vivo perfused liver experiment model to reproduce a more accurate physiological state for prolonged experiments without using live animals. Five intact livers and kidneys were retrieved post-mortem from sacrificed pigs on different days and perfused for a minimum of 6 hr. Hourly arterial blood gases were obtained to analyze pH, lactate, glucose and renal parameters. The primary endpoint was to investigate the effect of adding one kidney to the model on the acid base balance, glucose, and electrolyte levels. The result of this liver-kidney experiment was compared to the results of five previous liver only perfusion models. In summary, with the addition of one kidney to the ex vivo liver circuit, hyperglycemia and metabolic acidosis were improved. In addition this model reproduces the physiological and metabolic responses of the liver sufficiently accurately to obviate the need for the use of live animals. The ex vivo liver-kidney perfusion model can be used as an alternative method in organ specific studies. It provides a disconnection from numerous systemic influences and allows specific and accurate adjustments of arterial and venous pressures and flow.

Steps for the Autologous Ex vivo Perfused Porcine Liver-kidney Experiment

Study of the animal organ physiology can be achieved by performing an experimental ex vivo perfusion system. The addition of a porcine kidney, as a homeostatic organ to our previously developed ex vivo liver perfusion model can be a principal step to achieve a better physiological environment.

The use of ex vivo perfused models can mimic the physiological conditions of the liver for short periods, but to maintain normal homeostasis for an ...

Isolation, Culture, and Imaging of Human Fetal Pancreatic Cell Clusters

For almost 30 years, scientists have demonstrated that human fetal ICCs transplanted under the kidney capsule of nude mice matured into functioning endocrine cells, as evidenced by a significant increase in circulating human C-peptide following glucose stimulation1-9. However in vitro, genesis of insulin producing cells from human fetal ICCs is low10; results reminiscent of recent experiments performed with human embryonic stem cells (hESC), a renewable source of cells that hold great promise as a potential therapeutic treatment for type 1 diabetes. Like ICCs, transplantation of partially differentiated hESC generate glucose responsive, insulin producing cells, but in vitro genesis of insulin producing cells from hESC is much less robust11-17. A complete understanding of the factors that influence the growth and differentiation of endocrine precursor cells will likely require data generated from both ICCs and hESC. While a number of protocols exist to generate insulin producing cells from hESC in vitro11-22, far fewer exist for ICCs10,23,24. Part of that discrepancy likely comes from the difficulty of working with human fetal pancreas. Towards that end, we have continued to build upon existing methods to isolate fetal islets from human pancreases with gestational ages ranging from 12 to 23 weeks, grow the cells as a monolayer or in suspension, and image for cell proliferation, pancreatic markers and human hormones including glucagon and C-peptide. ICCs generated by the protocol described below result in C-peptide release after transplantation under the kidney capsule of nude mice that are similar to C-peptide levels obtained by transplantation of fresh tissue6. Although the examples presented here focus upon the pancreatic endoderm proliferation and &#946;&#160;cell genesis, the protocol can be employed to study other aspects of pancreatic development, including exocrine, ductal, and other hormone producing cells.

A protocol to isolate, culture, and image islet cell clusters (ICCs) derived from human fetal pancreatic cells is described.&#160; The method details the steps necessary to generate ICCs from tissue, culture as monolayers or in suspension as aggregates, and image for markers of proliferation and pancreatic cell fate decisions.

मानव भ्रूण अग्नाशय सेल समूहों के अलगाव, संस्कृति, और इमेजिंग

For almost 30 years, scientists have demonstrated that human fetal ICCs transplanted under the kidney capsule of nude mice matured into functioning ...

Leprdb Mouse Model of Type 2 Diabetes: Pancreatic Islet Isolation and Live-cell 2-Photon Imaging Of Intact Islets

Type 2 diabetes is a chronic disease affecting 382 million people in 2013, and is expected to rise to 592 million by 2035 1. During the past 2 decades, the role of beta-cell dysfunction in type 2 diabetes has been clearly established 2. Research progress has required methods for the isolation of pancreatic islets. The protocol of the islet isolation presented here shares many common steps with protocols from other groups, with some modifications to improve the yield and quality of isolated islets from both the wild type and diabetic Leprdb (db/db) mice. A live-cell 2-photon imaging method is then presented that can be used to investigate the control of insulin secretion within islets.

Leprdb Mouse Model of Type 2 Diabetes: Pancreatic Islet Isolation and Live-cell 2-Photon Imaging Of Intact Islets

We present here a protocol for the isolation of islets from the mouse model of type 2 diabetes, Leprdb and details of a live-cell assay for measurement of insulin secretion from intact islets that utilizes 2 photon microscopy.

Lepr<sup&gt; DB</sup&gt; टाइप 2 मधुमेह के माउस मॉडल: बरकरार islets के अग्नाशय आइलेट अलगाव और लाइव सेल 2 फोटॉन इमेजिंग

Type 2 diabetes is a chronic disease affecting 382 million people in 2013, and is expected to rise to 592 million by 2035 1. During the past 2 decades, ...

Intraportal Transplantation of Pancreatic Islets in Mouse Model

Pancreatic islet transplantation to reduce hyperglycemia is highly successful in rodents with chemically-induced diabetes. The most common transplantation site in experimental islet transplantation is the kidney capsule. However, as less is known about the interaction of pancreatic islets with blood constituents, it also makes sense to utilize the portal vein approach in experimental islet transplantation.
This protocol demonstrates an intraportal islet transplantation technique in NMRI nude mice. Streptozotocin (180 mg/kg) is injected intraperitoneally to induce hyperglycemia in recipient mice. They are considered as diabetic at a non-fasting blood glucose level greater than 20 mmol/L. One day prior to transplantation, mouse pancreatic islets are isolated from the donor pancreas by collagenase digestion; a minimum of 350 islets are utilized per diabetic recipient. Depending upon the islet isolation yield, two or more donor mice are utilized per recipient. After overnight culture at 37 &#176;C, islets are administered into the recipient liver via the portal vein. After surgery, the mice are protected in red Makrolon houses and observed until are awake. This protocol maintains glycemic control for 120 days in syngeneic mice and 15 days in allogeneic mice.

Pancreatic islet transplantation is a way to achieve normoglycemia in type 1 diabetes. This article focuses on the transplantation technique through the intraportal route to maintain normal glucose levels in diabetic mice.

माउस मॉडल में अग्नाशय के टाप का Intraportal प्रत्यारोपण

Pancreatic islet transplantation to reduce hyperglycemia is highly successful in rodents with chemically-induced diabetes. The most common transplantation ...

Visualization of Endogenous Mitophagy Complexes In Situ in Human Pancreatic Beta Cells Utilizing Proximity Ligation Assay

Mitophagy is an essential mitochondrial quality control pathway, which is crucial for pancreatic islet beta cell bioenergetics to fuel glucose-stimulated insulin release. Assessment of mitophagy is challenging and often requires genetic reporters or multiple complementary techniques not easily utilized in tissue samples, such as primary human pancreatic islets. Here we demonstrate a robust approach to visualize and quantify formation of key endogenous mitophagy complexes in primary human pancreatic islets. Utilizing the sensitive proximity ligation assay technique to detect interaction of the mitophagy regulators NRDP1 and USP8, we are able to specifically quantify formation of essential mitophagy complexes in situ. By coupling this approach to counterstaining for the transcription factor PDX1, we can quantify mitophagy complexes, and the factors that can impair mitophagy, specifically within beta cells. The methodology we describe overcomes the need for large quantities of cellular extracts required for other protein-protein interaction studies, such as immunoprecipitation (IP) or mass spectrometry, and is ideal for precious human islet&#160;samples generally not available in sufficient quantities for these approaches. Further, this methodology obviates the need for flow sorting techniques to purify beta cells from a heterogeneous islet population for downstream protein applications. Thus, we describe a valuable protocol for visualization of mitophagy highly compatible for use in heterogeneous and limited cell populations.

This protocol outlines a method for quantitative analysis of mitophagy protein complex formation specifically in beta cells from primary human islet samples. This technique thus allows analysis of mitophagy from limited biological material, which are crucial in precious human pancreatic beta cell samples.

मानव अग्नाशय बीटा कोशिकाओं में Situ में अंतर्जात Mitophagy परिसरों का दृश्य निकटता लिगेशन परख का उपयोग

Mitophagy is an essential mitochondrial quality control pathway, which is crucial for pancreatic islet beta cell bioenergetics to fuel glucose-stimulated ...